NSObjectController add: Method RunLoop Deferral
NSObjectController add: Method RunLoop Deferral
- Subject: NSObjectController add: Method RunLoop Deferral
- From: Richard Somers <email@hidden>
- Date: Mon, 2 Nov 2009 13:51:54 -0700
Consider a NSObjectController, controller, which is in entity mode and
bound to a managed object context. The following code is in an
initialization method.
[controller add:self];
id value = [controller valueForKeyPath:@"selection.numObj"];
double num = [value doubleValue];
This produces an error: -[_NSStateMarker doubleValue]: unrecognized
selector sent to instance.
I think the problem is with the add: method. The documentation states
"Beginning with Mac OS X v10.4 the result of this method is deferred
until the next iteration of the runloop so that the error presentation
mechanism can provide feedback as a sheet."
I can not figure out how to work around this.
Richard
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